Expanding reamer



5, 1932. F. c. EISENMANN EXPANDING REAMER Filed June 2, 1928 [IIIINVENTOR 4 rod at all times in its operative position.

Patented Jan. 5, 1932- FREDERICK G. EISEN MANN, 0F PHILADELPHIA,PENNSYLVAN EXPANDING REAMER Application filed'June 2, 1928. Serial No.282,375.

The object of this invention is to devise a novel and simplifiedconstruction of an expanding reamer wherein the reaming plates can beadjusted withouttaking the reamer 5 apart.

A further object is to devise a novel and simplified construction of areamer wherein the reamer plates are adjusted by means of a cone havingin threaded engagement with it an adjusting member which overhangs theplates and which is accessible when the ream-- or is assembled.

With the above and other objects in view as will more clearlyhereinafter appear, my

. reamer.

It further comprehends a novel construc-- tion of an expanding reamerwherein the body portionis provided with a longitudinally adjusting conewhich is accurately guided therein and which is threaded to receive anadjusting rod having a collar to overhang the reaming plates andprovided with-a nut in threaded engagement with the body portion andretaining said actuating Other novel features of construction andadvantage will hereinafter more clearly appear in the detaileddescription and the appended claims.

For the purpose of illustrating the-invention, I have shown in theaccompanying drawings a typical embodiment of it, which,

in practice, will give reliable and satisfactory results. It is,however, to be understood that this embodiment is typical only and thatthe various instrumentalities of which my invention consists can bevariously arranged and organized, and that the invention is not limitedto the precise arrangementand 0rganization of these instrumentalities ashere in set forth. 1

Figure 1 is a longitudinal section of an invention comprehends a novelexpanding thev plates and their fastening means removed.

Figure 4 is an end view of Figure 3. Figure?) is a plan view in detachedposition of the actuating member.

Figure. 6 is a plan view in detached posi- 7 tion of the cone. v

Figure 7 is an end elevation of an end cap employed.

Figure 8 is a section on line 88 of Figure 7.

Figure 9 is an end view of an abutment nut.

Figure 10 is a section on line 1010 of Figure 9. Figure 11 is a sideelevation of one of the reaming plates.

Similar numerals of reference indicate corresponding parts. Referring tothe drawings 1 designates thebody portion of an expanding reamerembodying my invention. The body portion is provided with a rearwardlyextending cylindrical shank 2 which terminates in a polygonally shapedextension 3.

The body portion is provided with the longitudinally extending slots 1which are adapted to receive the reaming plates 5, the

outer faces of which are straight while the outwardly or slightlytapered as indicated at 7. The body portion is provided with an apertureor bore 8 which, at its rear portion, merges into a cylindrical aperture9, and the wall of the bore 8 at its forward end is threaded as at 10. p

11 designates a cone longitudinally adjustable in the bore 8 andprovided with a cylindrical extension 12 at-its rearward end whichaccurately fits the cylindrical extension 9. The cone 11 is providedwith an internally threaded aperture 13 which opens at its forward endand which is adapted to receive a threadedrod 14 which forms anactuating or adjusting memberfor the cone 11 and thereby for the plates5. 1

The adjusting member is provided with a. collar 15 which bears againstthe forward ends of the knife plates and which is secured in position bymeans of a nut 16 engaging the threads 10 of the body portion andprovided with the spanner receiving openings 17.

The rear face of the nut 16 is recessed as at 18 to receive the collar15. The nut 16 is apertured as at 19 to permit the forward cylindricalextension 20 of the adjusting member to pass therethrough, and theforward end is preferably provided with a slot 21 adapted to receive atool, such as for example, a screw driver, for effecting its rotaryadjustment.

The body portion 1 is externally threaded as at. 22 to receive aclamping nut 26 which bears against the rear ends'of the reaming 11 isprevented from rotation during its adthe shank 2 extension 20 of theadjusting member by justment by means of a screw 27 carried by of thebody portion and extending into a longitudinally extending slot 28 inthe cylindrical portion 12.

I also preferably secure to the cylindrical means of a fastening device,such as for ex ample the pin 29 illustrated, a washer 30, so that theadjusting device is locked with re- ,spect to the nut 16. It will beseen that the adjusting device is thus permitted to revolve withoutlongitudinal movement.

7 Assuming now that the reamer is in as sembled condition and it isdesired to ad ust the reaming plates, one of the nuts 26 or '24 isloosened, and the adjusting member is turned in the proper direction tocause the threaded rod 1% to move the cone 11 forwardly or rearwardlyand then the nut which has been loosened is tightened, so that thereaming-plates will be rigidly clamped in the position to which theyhave been adjusted.

Special attention is directed to the fact that the adjusting member isalways accessible without taking the reamer apart, as the end 20 extendsforwardly into such position that it can be actuated by a desired typeof operating tools, such as for example, a screw driver. I

My present invention can be economically manufactured and any partswhich are sub jected to wear may be readily replaced.

The present construction of reamer provides a large range of adjustmentand the reaming plates can be readily removed when it is desired tosharpen them or to replace them. It will also be apparent that the.cones 11. have a different taper fromv thatillustrated and may besubstituted for the one illustrated in the drawings. My presentconstruction of reamer is of special advantage since it can be made inSlIlZLll'SlZBS and still have the requisite strength to accomplish thework for which it is intended.

In some cases, it is preferable to provide the shank 12 with the slot orkey-way 27 int-owhich extends a screw 28 carried by the body portion ofthe reamer, so that the cone will have a rectilinear movement during itslongitudinal adjustment without any relative rotation with the bodyportion.

It is also advantageous to employ, in some cases, a washer 29 fixed tothe extension 20 by means of av pin or equivalent fastening device 30,and the nut 16 is preferably recessed to 'IGCBIVG such Washer. Thismaintainsaccurate alignment of the adjusting member at all times.

It will now be apparent that I have de vised a new and useful expandingreamer which embodies the features of advantage enumerated as desirablein'tlie statement of the invention and the above description, and whileI have, in the present nstance, shown and described a preferredembodiment thereof which will give in practice satisfactory and reliableresults, it is to be understood that this embodiment is susceptible ofmodification in various particulars without de parting from the spiritor scope of the invention or sacrificing any of its advan ta es.

Having thus described my invention w at I claimas new and desire tosecure by Letters Patent, is

1. In an expanding reamer, a body portion having blade receiving slotsand having .a shankprovided with an opening through one end and ofreduced diameter at its rear end, a cone slidable in said opening v andhaving a rearwardly extending cylindrical extension to fit the reduceddiameter of said opening, means common to said body portion andcylindrical extension to prevent their relative rotation, blades in'saidslots having their inner faces inclined throughout their length, a coneadjusting member in threaded engagement with said cone and having meansabutting against the forward ends of said blades, a nut in threadedengagement with said body portion and hearing against the forward endsof said blades, and a nut in threaded engagement with said body portionand bearing against the rear ends of said blades to contribute to retainthem in their locked position.

2..In an expanding reamer, a body portion having blade receiving slotsand having a shank provided with an opening through itsforward end andof reduced diameter at its rearward end, a cone slidable in said openingand having at its rearend a cylindevice carried by said shank andextending into said slot, reaming blades in said body portion slots andhaving their inner faces inclined throughout their length to engage saidcone, a cone adjusting member in threaded engagement with said cone andhaving a collar abutting against said blades, a nut in threadedengagement with the outer wall of said bore and-forming an abutment forsaid collar, said cone adjusting member extending through said nut intoa osition accessible to the operator, the end aces of said bladesinclining outwardly and towards each other, and forward and rear nuts onsaid body portion conforming toand engaging the inclining portions ofsaid blades to secure them in clamped position.

FREDERICK C. EISENMANN.

